Stratocaster, what are the mods?
I had tried front damping with toilet paper/foam, the quarter mod, back damping (in specific locations, as in around the baffle holes and behind the driver or everywhere except directly behind the driver), removing the back foam, removing the plastic baffle that held the back foam, using the headphones grilless, putting electrical tape on the plastic of the earpads to increase seal with the headphone body, adjusting the clamp, and changing the compliance of the earpads.
Basically, I like your graph linearity and distortion measurements very, very much. (No ear pain and headaches from spikes/recession/harmonic distortion addition to specific frequency bands--yessss!!!--more time spent listening and without fatigue during and afterword--yesss!!!--reasonable cost---yesss!!!).